By Thomas W. Schultz
At the present time, every thing from cellphones to microwaves to CD avid gamers all comprise microcontrollers, or miniature desktops, which must be programmed to accomplish particular initiatives. Designing such structures calls for an knowing of either microprocessor electronics and programming languages. This e-book is written for the economic electronics engineer who must use or swap to the Intel 8051 family members of microcontrollers and enforce it utilizing a c language. .
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Extra info for C and the 8051: Hardware, Modular Programming & Multitasking
The variations of the indexed addressing mode are described in the following subsections. 7 Indexed Addressing Modes with Constant Offsets The syntax of the indexed addressing mode with constant offset is as follows: n, r where n is a 5-bit, 9-bit, or 16-bit constant r is the base register and can be X, Y, SP, or PC For example, ldaa 4,X ; A ← [4 1 [X]] loads the contents of the memory location with the address equal to the sum and 4 and X into A. 9 ■ 27 HCS12 Addressing Modes For example, staa ; m[[B] 1 [X]] ← [A] B, X stores the contents of A in the memory location of which the address equals the sum of the contents of B and X.
R = base register (may be X, Y, or SP). 10 16-Bit Offset Indexed Indirect Mode The syntax of this addressing mode is as follows: [n, r] where n is the 16-bit offset r is the base register and can be X, Y, SP, or PC In this mode, the HCS12 fetches the actual effective address from the memory location with address equal to the sum of the 16-bit offset and the contents of the base register and then uses that effective address to access the operand. The square brackets distinguish this addressing mode from 16-bit constant offset indexing; for example, ldaa [10, X] In this example, index register X holds the base address of a table of pointers.
At the end of this read cycle, the PC is incremented to 0x000A. The opcode byte 0xE0 is fetched. Step 3 The control unit recognizes that the current instruction requires performing a read operation to the data memory with the address specified by the ptr register. The processor places the 16-bit value of the ptr register on the data memory address bus and indicates this is a read operation. 6 ■ 19 Program Execution Step 4 The data memory returns the contents to the processor and the processor places it in accumulator A.